DHC2800S SERIES 7.5W DC-DC CONVERTERS DHW2805S M I C R O T E C H N O L O G Y HTTP://WWW.APEXMICROTECH.COM (800) 546-APEX (800) 546-2739 HI-REL DESIGN • • • • WAVE SOLDERABLE PACKAGE ALL CERAMIC CAPACITORS SURFACE MOUNT MAGNETICS WITHSTANDS 5000G FEATURES—SINGLE OUTPUT • • • • • • • NO DERATING — –55° C to +125° C SUPPLY RANGE — 16V to 40V HIGH ISOLATION — 500V HIGH POWER DENSITY — 21W/IN3 OUTPUT VOLTAGE ADJUSTMENT STANDARD REMOTE SHUTDOWN OPERATES 11 TO 50VIN AT 5W Package Dimensions 1" W x 1" L x .35" H TYPICAL APPLICATION WITH OPTIONS 10nF 8 DESCRIPTION The DHW2805S DC-DC converter is a high performance version of our standard DHC2805S converter. This converter provides the ruggedness, reliability, and features required to meet the advanced design challenges of today’s hi-rel market. This is accomplished while retaining a power density of 21 W/ in3 and 525 mW/gram of power/package performance. The use of advanced substrate and reflow soldering techniques during construction results in a rugged, cost-effective, and completely solderable package. DHW2805S hybrid converter utilizes all ceramic capacitors and surface mount magnetics to provide reliable operation at all operating temperatures while surviving very high G forces. DHW2805S standard features include output fault monitoring and/or turn on voltage point programming via the shutdown pin. All three functions may be implemented simultaneously with a minimum of external components. An output voltage adjustment / load compensation pin is also standard however DHW2805S may be ordered without this feature (/F option). Fault tolerant design protects these converters from most external circuit faults. The output and output adjust pins will withstand +35 V while the shutdown pin will withstand +50 V protecting the converters from a variety of system or board faults i.e. solder bridges etc. Unique load fault protection circuitry allows this converter to pull up loads having difficult static load line characteristics and allows short term load excursions significantly beyond ratings in most applications. A transformer isolated forward converter topology operating at a switching frequency of 400 kHZ allows operation over a wide input voltage range. Internal filtering of both input and output eliminates the need for external capacitors in many applications. The 8-pin DIP package (see Package Outlines) is hermetically sealed and isolated from the internal circuits. Heat sinking is recommended for full power operation at elevated ambient temperatures. 3 +V 1 DHW2805S 50K 2 VTRIM 5 SET UV LOCKOUT 7 6 –V Control System RSP +5V 200K VIN 5K SHUTDOWN OPTO J174 OPERATION NORMAL (TTL) BLOCK DIAGRAM 6 1 2 5 PWM FEED FORWARD CONTROLLER 7 ERROR AMPLIFIER REFERENCE AND ISOLATION 3 EXTERNAL CONNECTIONS + OUTPUT 1 – OUTPUT 2 ADJUST/COMP* 3 NO CONNECTION 4 SHUTDOWN PLUS 5 TOP VIEW 8 CASE 7 – INPUT 6 + INPUT * Optional N/C on DHW2805S/F APEX MICROTECHNOLOGY CORPORATION • TELEPHONE (520) 690-8600 • FAX (520) 888-3329 • ORDERS (520) 690-8601 • EMAIL [email protected] Powered by ICminer.com Electronic-Library Service CopyRight 2003 ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS DHW2805S ABSOLUTE MAXIMUM RATINGS INPUT VOLTAGE RANGE (Pin 7 to 6 or 5) INPUT TRANSIENT (Pin 7 to 6) OUTPUT WITHSTAND (Pin 2 to 1 or 3) OUTPUT CURRENT (Continuous) TEMPERATURE, Storage TEMPERATURE, Pin Soldering 10s 0-50Vdc 80V @ 50ms 35Vdc 1.5Adc –65°C, 150°C 300°C SPECIFICATIONS PARAMETER TEST CONDITIONS1 MIN TYP MAX UNITS STEADY STATE CHARACTERISTICS INPUT VOLTAGE RANGE OUTPUT VOLTAGE OUTPUT CURRENT VIN; min ↔ max Vdc @ IMIN VIN; min ↔ max Vdc 16 5.00 120 28 5.05 40 5.1 1500 Vdc Vdc mAdc EFFICIENCY OUTPUT RIPPLE VOLTAGE INPUT RIPPLE CURRENT Bandwidth 10kHz ↔ 1MHz Bandwidth 10kHz ↔ 1MHz 64 68 40 40 100 100 % mVrms mArms OUTPUT POWER2 LINE REGULATION LOAD REGULATION VIN; min ↔ max3 IOUT; min ↔ max3 6 10 7.5 15 25 W mVdc mVdc 125 45 2.5 %/°C °C mAdc mAdc TEMPERATURE COEFFICIENT TEMPERATURE RANGE, case2 QUIESCENT CURRENT INHIBITED IOUT = 0A Vpin5; < 8Vdc ISOLATION CHARACTERISTICS (input/output/case) LEAKAGE RESISTANCE LEAKAGE CAPACITANCE VTEST = 500Vdc f = 10kHz DYNAMIC CHARACTERISTICS LINE STEP RESPONSE VOLTAGE CHANGE RECOVERY TIME (95%) LOAD STEP RESPONSE VOLTAGE CHANGE RECOVERY TIME (95%) DYNAMIC CHARACTERISTICS START-UP OVERSHOOT SHUTDOWN DELAY SHUTDOWN RECOVERY TIME4 NOTES: CAUTION 1. 2. 3. 4. .6 .006 –55 VIN; TR, TF = 10µs VIN; 16 ↔ 40 Vdc IOUT; TR, TF = 10µs IOUT; 50% ↔ max Adc VIN; 0-50 Vdc VPIN5; > 10Vdc → <8Vdc VPIN5; < 8Vdc → > 10Vdc .09 38 1.25 100 60 MΩ pF 300 30 mV µs 700 40 mV µs 0 220 60 400 500 ms mV µs Unless otherwise stated: TC = 25°C, VIN = 28V, IOUT = IOUT MAX. Derate power linearly to zero from 125°C to 135°C. Regulation measured between pin 1 and pin 2 1/6" from case. Recovery spec assumes that converter has been OFF for at least 500ms. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. PACKAGE THERMAL SPECIFICATIONS RESISTANCE, case to air TEMPERATURE RISE, junction to case MIN TYP MAX UNITS 30 15 20 °C/W °C APEX MICROTECHNOLOGY CORPORATION • 5980 NORTH SHANNON ROAD • TUCSON, ARIZONA 85741 • USA • APPLICATIONS HOTLINE: 1 (800) 546-2739 Powered by ICminer.com Electronic-Library Service CopyRight 2003 APPLICATION INFORMATION DHW2805S OUTPUT ADJUST / COMP LOAD FAULT RESPONSE The output voltage of the DHW2805S may be adjusted from 90% to 110% of nominal value by the use of a 50kΩ potentiometer as shown. Adjustment beyond this range is possible however certain characteristics of the converter such as but not limited to input voltage range, efficiency, ripple and temperature performance will change. Characterization by the user is recommended in such applications. The Apex families of DC-DC converters share load fault philosophies. Load fault conditions include short-circuit and severe overload conditions. The DHW2800 converter series responds to load faults by turning off all power conversion circuits for 250 mS and then attempting to restart for 10 mS (typical). The net "on" duty factor during a fault is very low resulting in low converter dissipation and immunity from overheating at 125°C. Current beyond rated can flow into the load at startup time. This allows the converter to bring up capacitive and other difficult load types more reliably than competing converters. 3 1 2 50K 10nF Vo O Adjust/comp (pin 3) may be driven by external circuitry referenced to pin 2 (-output) if desired. Grounding pin 3 causes voltage to increase (25% typically) while driving pin 3 above 1.3 V causes output voltage to decrease. Pin 3 may be driven through 10KΩ or more if connection of the comp function is also required. The comp function of pin 3 allows capacitive loads as large as 1000 µF to be accommodated on the DHW2805S without loss of stability. This feature may be utilized by connecting a 10 nF capacitor between pins 3 and 1. This is generally recommended when low esr load capacitances of 100 µF or greater are used. Io O NORMAL LOAD FAULT NORMAL TIME SHUTDOWN PLUS Pin 5 is used for remote shutdown, output fault detection, and/or setting the input voltage point at which the converter will turn on as shown in the typical application diagram. No connection to pin 5 is necessary for normal operation of the converter. Pin 5 is referenced to the –input (pin 7). Shutdown may be implemented by simply connecting pin 5 to an open collector logic output or switch rated at 2.5 mA, 25 Vdc or higher. Input voltage turn on point is programmed with a single resistor from pin 5 to 7. An input turn on/off hysteresis (typically 3.5% of Vin) will be observed. This should be considered when making or verifying set point adjustment. The value of the setpoint resistor may be determined by the following: 3 R = 210 • 10 ETO – 9.5 (±10% accuracy at 25°C) Set point temperature coefficient is typically +400ppm/°C. Output fault monitoring is accomplished by observing pin 5 with a high impedance monitoring circuit. Pin 5 voltage drops from over 10 V to below 1 V when a load fault causes the converters fault protection circuitry to activate. It will remain low for at least 100 ms and return high. If the load fault is still present pin 5 will return low and the cycle will repeat. A resistor > 400 kΩ from pin 5 to 7 provides pull down for pin 5 if there is no input setpoint programming resistor already in place. This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice. DHW2805SU REV. B JANUARY 1999 © 1999 Apex Microtechnology Corp. Powered by ICminer.com Electronic-Library Service CopyRight 2003